If the current meter is measuring on the "low side" then this method makes the grounds all different, and not really grounds at all. Do you know if your current meter is "low side", or what I like better "high side"?

Welcome to a group of makers all using Python and the ArduinoYour instructable is now featured in the collection:Arduino and Python and Perhaps a Rasberry Pi: see: http://instructables.com.mevn.net/id/Arduino-and-Pyth...

Note that the two "ground" connections are not actually at the same potential, the shunt for the current measurement separates them and causes a small voltage drop. Do not connect them together external to the meter.

Welcome to the club: Just a note to let you know I have added this instructable to the collection:Encyclopedia of ATX to Bench Power Supply Conversion >> http://instructables.com.mevn.net/id/Encyclopedia-of-A...Take a look at about 70 different approaches to this project. This topic is one of the more popular of all instructables.

I actually meant at least one link to the exact part. Of course each reader can do this for themselves, but it is nice if the author, who often knows for sure can do this. At your link a search for sensor gives 1600 results. A more precise search would probably give far fewer results. I like to think that details like this get your instructable featured.

Welcome to the club: Just a note to let you know I have added this instructable to the collection: Encyclopedia of ATX to Bench Power Supply Conversion>> http://instructables.com.mevn.net/id/Encyclopedia-of-A...Take a look at about 70 different approaches to this project. This topic is one of the more popular of all instructables.

The picture of your device looked a bit like one of mine, built for a slightly different purpose. I think we may be using the same voltage regulator in fact. I also notice that you are using a case, my project builds a platform over the RPi for a similar purpose. You or others might be interested in this slightly different approach: http://instructables.com.mevn.net/id/Raspberry-Pi-Pla...

Measuring voltage but not current ( at the same time ) tells just about zip about power. These cells can sometimes deliver a lot of current. How about a bunch more measurements including voltage and current with the cell under load?

This is a topic near and dear to my heart, well almost. I am working on my own data logger but not ready to publish yet. I did write an instructable on logging with 2 major ideas, moving averages and reducing the amount of data to log. Might be useful for your project: Experiments in Advanced Data Logging ( Using Python ): 11 Stepshttp://instructables.com.mevn.net/id/Experiments-in-Advanced-Data-Logging-Using-Python-/

A problem with this circuit is that if the pot is turned all the way "up" it will likely burn out the LED. Also if turned all the way "down" the LED may still be too bright.

Just some notes:A pot can be connected as a variable resistor or a variable voltage divider, one needs 2 terminals, one three.That is what is going on here, a variable resistor.Second the better name of the middle connection is the wiper. See: Potentiometer - Wikipediahttps://en.wikipedia.org/wiki/Potentiometer. Input is bad since it is often used more like an output.

I did not watch the video, I pretty much never do on instructables; so this comment is limited to the text. ( I did however, download and read the code, { who is E-Guy ? } )In the text there is not schematic or code for voice recognition, this is apparently all done by the phone and perhaps the cloud.In a system like this, that part of voice recognition is the heavy lifting. I think the text should discuss it. What do you think?

SSD drives are great, and perhaps one of the best comparisons is boot up since it is largely IO bound. But often a compute intensive program runs with almost no disk IO. The 5x speed up does not seem to be supported even by your text, I think you are somewhat overselling what is in fact a good thing.